{"affected":[{"defaultStatus":"unaffected","product":"ipfixcol2","source":"CNA: VulnCheck","vendor":"CESNET","versions":[{"lessThan":"2.9.0","status":"affected","version":"2.7.1","versionType":"semver"}]}],"cveId":"CVE-2026-122127","cwes":["CWE-787"],"description":"CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793824608956,"publishedAt":1793824608956,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/CESNET/ipfixcol2/commit/fd5cb168efb4b864d33f655174711b2779cef502"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/CESNET/ipfixcol2"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cpp#L139-L151"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.7.1-before-2.9.0-heap-buffer-overflow-via-tcp-lz4-decoder"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/CESNET/ipfixcol2/commit/fd5cb168efb4b864d33f655174711b2779cef502"}],"revision":"a82fff64fea1a515fc90cbea5cd4bbe44b77de9f94561163f53e801e5f46342b","sources":[{"modifiedAt":1793824608956,"name":"CNA: VulnCheck","retrievedAt":1793826720531,"url":"https://www.cve.org/CVERecord?id=CVE-2026-122127"}],"ssvc":null,"status":"published","title":"CESNET ipfixcol2 2.7.1 before 2.9.0 Heap Buffer Overflow via TCP LZ4 Decoder","updatedAt":1793826720531}